triggering with a flag

I was wondering if it's possible to make a trigger only trigger if a person carrying the flag walks into it?
Could I parent something to the flag?
Use a filter for a name and filter for the intel?
I have tried both of those but neither worked.

yeah, but the problem witha prox trigger is that is covers a circular area so there will either be blind spots or overlapping spots.
But no worries, ABS came up with a solution. But thanks to those who tried.